Move GetDocument method from WebFrame to WebLocalFrame.

content/renderer/browser_plugin/browser_plugin.cc

Index: content/renderer/browser_plugin/browser_plugin.cc
diff --git a/content/renderer/browser_plugin/browser_plugin.cc b/content/renderer/browser_plugin/browser_plugin.cc
index 64eaa786cd7106b9f74802c00e85effa097871d0..301ea0ef67a2c316fc7fa72afca62f0eebbd85a9 100644
--- a/content/renderer/browser_plugin/browser_plugin.cc
+++ b/content/renderer/browser_plugin/browser_plugin.cc
@@ -5,7 +5,11 @@
 #include "content/renderer/browser_plugin/browser_plugin.h"
 
 #include <stddef.h>
+
+#include <map>
+#include <string>
 #include <utility>
+#include <vector>
 
 #include "base/command_line.h"
 #include "base/location.h"
@@ -159,7 +163,11 @@ void BrowserPlugin::Attach() {
     blink::WebLocalFrame* frame = Container()->GetDocument().GetFrame();
     attach_params.is_full_page_plugin =
         frame->View()->MainFrame()->IsWebLocalFrame() &&
-        frame->View()->MainFrame()->GetDocument().IsPluginDocument();
+        frame->View()
+            ->MainFrame()
+            ->ToWebLocalFrame()
+            ->GetDocument()
+            .IsPluginDocument();
   }
   BrowserPluginManager::Get()->Send(new BrowserPluginHostMsg_Attach(
       render_frame_routing_id_,